Congenital bilateral absence of the semimembranosus muscles

Quantitative study of the popliteal fossa in the human fetus

“…Liu et al [6] and Sussmann [26] reported the bilateral absence of the semimembranosus muscle. Chason et al [27] observed the tensor fasciae suralis, the belly of which originated from the lateral aspect of the semitendinosus muscle and extended to the distal thigh.…”